From "Transaction of the Horticultural Society of London", 1842, p. 245: "Observations upon the Effect of...the Frost...in England in the Winter of 1837-8"
[• indicates that a plant has been entirely killed, or so nearly so that it was not worth preserving ; Ø that it was much injured, but not killed ; o that it was uninjured, or hurt in no considerable degree.]
Courtesy of the Biodiversity Heritage Library